owlsplace Posted June 26, 2016 Report Share Posted June 26, 2016 I was browsing the 2016 LIS (loudspeaker industry sourcebook) that came in today's mail reading an article on ferrofluid written by insiders. Discussion went to the use of ferrofluid for coil centering ... "All the way back in the early 1970's, AR discovered that the spider could be removed and ferrofluid used for centering in single-point suspension designs (e.g., the the AR-4x cone tweeter). I've never had one of these apart but wasn't under the impression that the 4x tweeter used ferrofluid... anyone? Reference photo: Roger Link to comment Share on other sites More sharing options...
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